opal
n. C / U C2 Proficiency US //ˈoʊpəɫ// UK //ˈəʊpəl// opal
n. a precious stone that shows different colors when the light hits it. It is often used in jewelry like rings or necklaces.
n. a hydrated amorphous form of silica, valued as a gemstone for its iridescent play of colors. The internal structure diffracts light, creating a characteristic shifting spectrum.
She wears a beautiful opal ring.
The jeweler explained that the opal's value depends on the intensity and variety of colors visible in the stone.
Unlike diamonds which rely on clarity, the opal is prized for its unique internal fire, where microscopic spheres of silica scatter light into a vivid rainbow of hues.
Usage
Uncountable when referring to the mineral or material; countable when referring to individual stones or varieties.